Thiago Araujo thdaraujo

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

Getting started

First add your twitter username and password. Then server.rb and once it's started open websocket.html in your browser. You should see some tweets appear. If not take a look at the javascript console.

	# Support for Rspec / Capybara subdomain integration testing
	# Make sure this file is required by spec_helper.rb
	#
	# Sample subdomain test:
	# it "should test subdomain" do
	# switch_to_subdomain("mysubdomain")
	# visit root_path
	# end

	DEFAULT_HOST = "lvh.me"

	# fibonacci
	h = Hash.new { \|hash,key\| hash[key] = hash[key-1] + hash[key-2] }
	h[1] = 0
	h[2] = 1

	defmodule Fib do
	def fib(0) do 0 end
	def fib(1) do 1 end
	def fib(n) do fib(n-1) + fib(n-2) end
	end

	IO.puts Fib.fib(10)

	For each Ruby module/class, we have Ruby methods on the left and the equivalent
	Clojure functions and/or relevant notes are on the right.

	For clojure functions, symbols indicate existing method definitions, in the
	clojure namespace if none is explicitly given. clojure.contrib./ functions can
	be obtained from http://github.com/kevinoneill/clojure-contrib/tree/master,
	ruby-to-clojure./ functions can be obtained from the source files in this
	gist.

	If no method symbol is given, we use the following notation:

	;; Why is Lisp so great? or Why so many parenthesis?

	;; The funny thing about Lisp is that everybody asks why it has so may parenthesis. Quite a few friends of mine who have studied Lisp in college don’t like it that much. I couldn’t really understand why, until I realized they usually take a class that uses the book Concepts of Programming Languages by Robert W. Sebesta as a textbook. I’m in no position to review this book because I haven’t read it. But from what I’ve skimmed, Lisp is not very well represented in this book, to put it very nicely. He describes Lisp only as a functional programming language, tells a little bit about cons cells, and that’s pretty much it! No object orientation in lisp, no syntactic abstraction, no meta-programming, and so on. My feeling is that if I didn’t know Lisp and read this book I wouldn’t be very impressed by Lisp.

	;; So why is Lisp so great and why so many parenthesis? These two different questions have the same answer; because Lisp have syntactic abstraction trough t